Yahtzee I is a mostly text based version of the popular dice game Yahtzee. It is based on a previous version by GOSUB INTERNATIONAL for the TRS-80 Model 1/3 originally published in 1979. The Coco version was released by July 1982 (and it's first ad showed up in that month's issue of 80-US Journal. They added a little bit of graphics (like the white outlines of the dice). The game allows up to 9 players, which is the largest group allowed of any of the Coco versions of Yahtzee that I have seen. Although it must be mentioned that you only see the score for the current player at any given time during the game.
Amusingly, the authors of the Coco version put in the highest score out of the 3 of them as a built in score to beat.
Title: Yahtzee I
Author: Gary Brown, Bob Moran, Paul Herder (Coco conversion)
Publisher: GOSUB International
Released: July 1982 (1st ad in 80 US Journal)
Requires: Color Computer 1,2,3, 16K RAM (tape) or 32K RAM (disk), Extended BASIC.